An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth (1888)
Gwilt, Joseph, 1784-1863, Papworth, Wyatt Angelicus Van Sandau, 1822-1894 · London Longmans, Green · leaf 335
OF THE PARAKOl.A. 1095. Defimtions.—1. The parameter of the axis of a parabola is a third proportionalto the abscissa and its ordinate. 2. The focus is that point in the axis where the ordinate is equal to the semi-pararneter. 3. The diameter is a line within the curve terminated thereby, and is… … 1O06. Theouem I. In the parabola, the abscissas are proportional to the squares of theiroriiinales. Let QVN (^fig. 44f2.) be a section of the cone passing along the axis, and let the direc-trix RX pass through the point Q perpendicular to Q.N, and let the|>arabolic section be AUI meeting the…
Architecture · Architects
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